added support for PLS path rendering

include/gpu/GrXferProcessor.h

Index: include/gpu/GrXferProcessor.h
diff --git a/include/gpu/GrXferProcessor.h b/include/gpu/GrXferProcessor.h
index ce26709d9ac16432d1dfe0c759777ac2f867e11e..3a698143c32322a4345eb8fd67dffe226fe77094 100644
--- a/include/gpu/GrXferProcessor.h
+++ b/include/gpu/GrXferProcessor.h
@@ -355,15 +355,19 @@ private:
                                                    const GrPipelineOptimizations& optimizations,
                                                    bool hasMixedSamples,
                                                    const DstTexture*) const = 0;
+
+    virtual bool onIsEqual(const GrXPFactory&) const = 0;
+
+    bool willReadDstColor(const GrCaps& caps,
+                          const GrPipelineOptimizations& optimizations,
+                          bool hasMixedSamples) const;
     /**
      *  Returns true if the XP generated by this factory will explicitly read dst in the fragment
      *  shader.
      */
-    virtual bool willReadDstColor(const GrCaps& caps,
-                                  const GrPipelineOptimizations& optimizations,
-                                  bool hasMixedSamples) const = 0;
-
-    virtual bool onIsEqual(const GrXPFactory&) const = 0;
+    virtual bool onWillReadDstColor(const GrCaps& caps,
+                                    const GrPipelineOptimizations& optimizations,
+                                    bool hasMixedSamples) const = 0;
 
     static uint32_t GenClassID() {
         // fCurrXPFactoryID has been initialized to kIllegalXPFactoryID. The